Chivinge, O.A.; Musambasi, D. & Mariga, I.K.
An on-farm experiment was conducted in Chinyika resettlement area during the 1994/95 and 1995/96 rainy seasons to determine the effects of 2,4-D, dicamba and hand weeding on Striga asiatica density and maize grain yield. Three sites were established during the 1994/95 season while an extra site was added during the 1995/96 season. Dicamba suppressed S. asiatica more than the other treatments at 8 and 10 weeks after crop emergence (wace) while 2,4-D was as effective as dicamba at 12 wace. In a drier season like the 1994/95, handweeding two times was more economic than applying the herbicides. Dicamba gave a marginal rate of return of 91% over 2,4-D during the wetter 1995/96 season. When the data were combined over sites, maize grain yields were lower in plots treated with dicamba and highest in plots hand weeded at 2 and 5 wace during the 1994/95 season. However, maize grain yields were similar in all the weeding treatments during the 1995/96 season.
An on-farm experiment was conducted in Chinyika resettlement area during the 1994/95 and 1995/96 rainy seasons to determine the effects of 2,4-D, dicamba and hand weeding on Striga asiatica density and maize grain yield. Three sites were established during the 1994/95 season while an extra site was added during the 1995/96 season. Dicamba suppressed S. asiatica more than the other treatments at 8 and 10 weeks after crop emergence (wace) while 2,4-D was as effective as dicamba at 12 wace. In a drier season like the 1994/95, handweeding two times was more economic than applying the herbicides. Dicamba gave a marginal rate of return of 91% over 2,4-D during the wetter 1995/96 season. When the data were combined over sites, maize grain yields were lower in plots treated with dicamba and highest in plots hand weeded at 2 and 5 wace during the 1994/95 season. However, maize grain yields were similar in all the weeding treatments during the 1995/96 season.
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